[llvm] DAG: Use poison for some vector element folds (PR #225406)

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llvmorg-github-actions[bot] wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-llvm-selectiondag

Author: Matt Arsenault (arsenm)

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<summary>Changes</summary>



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Full diff: https://github.com/llvm/llvm-project/pull/225406.diff


1 Files Affected:

- (modified) llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp (+7-4) 


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https://github.com/llvm/llvm-project/pull/225406